ogg_afh.c: Switch to ogg vorbis callbacks

This allows to call ov_clear() already during ogg_get_file_info() which
in turn simplifies ogg_close_audio_file().

This is a preparation for moving the close function of the audio
format handlers to the virtual streaming system as they all do
essentially the same now.

diff --git a/ogg_afh.c b/ogg_afh.c
index 6211deb3d0e27fe410854cd92ccfb60c8fc70f8a..3056a819b209eff6118748b60137bc92dc684e5a 100644 (file)
--- a/ogg_afh.c
+++ b/ogg_afh.c
@@ -33,12 +33,59 @@
 #define CHUNK_SIZE 32768
 static double chunk_time = 0.25;
 
-static OggVorbis_File *oggvorbis_file;
+FILE *audio_file;
 static int header_len;
 static char *header;
 static ssize_t *chunk_table;
 static struct audio_format_handler *af;
 
+static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
+{
+       FILE *f = datasource;
+       return fread(buf, size, nmemb, f);
+}
+
+static int cb_seek(__a_unused void *datasource, ogg_int64_t offset,
+               int whence)
+{
+       FILE *f = datasource;
+       return fseek(f, offset, whence);
+}
+
+/* don't do anything as vss still needs the open filehandle */
+static int cb_close(__a_unused void *datasource)
+{
+       return 0;
+}
+
+long cb_tell(void *datasource)
+{
+       FILE *f = datasource;
+       return ftell(f);
+}
+
+int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
+{
+       int ret = ov_open_callbacks(datasource, vf,
+               NULL, /* no initial buffer */
+               0, /* no initial bytes */
+               c); /* the ov_open_callbacks */
+
+       /* FIXME: provide better error codes */
+       if (ret == OV_EREAD)
+               return -E_OGG_READ;
+       if (ret == OV_ENOTVORBIS)
+               return -E_OGG_READ;
+       if (ret == OV_EVERSION)
+               return -E_OGG_READ;
+       if (ret == OV_EBADHEADER)
+               return -E_OGG_READ;
+       if (ret < 0)
+               return -E_OGG_READ;
+       return 1;
+
+}
+
 static int ogg_compute_header_len(FILE *file)
 {
        int ret, len, in = fileno(file);
@@ -144,9 +191,10 @@ static void tunetable(long unsigned num_chunks)
 /*
  * Alloc and fill array table of byte offsets. chunk_table[i] is the
  * offset in the current input file at which the sample containing time i *
- * CHUNK_TIME begins.
+ * CHUNK_TIME begins. Always successful.
  */
-static long unsigned ogg_compute_chunk_table(double time_total)
+static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
+       double time_total)
 {
        int i, ret, num;
        ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
@@ -162,10 +210,10 @@ static long unsigned ogg_compute_chunk_table(double time_total)
        max_chunk_len = 0;
        for (i = 1; ret == 0; i++) {
                ogg_int64_t diff;
-               ret = ov_time_seek(oggvorbis_file, i * chunk_time);
+               ret = ov_time_seek(of, i * chunk_time);
                if (ret)
                        break;
-               pos = ov_raw_tell(oggvorbis_file);
+               pos = ov_raw_tell(of);
                diff = pos - old_pos;
                max_chunk_len = PARA_MAX(max_chunk_len, diff);
                min = (i == 1)? diff : PARA_MIN(min, diff);
@@ -178,7 +226,7 @@ static long unsigned ogg_compute_chunk_table(double time_total)
        }
        num_chunks = i - 1;
        chunk_table[i] = pos;
-       tunetable(num_chunks);
+//     tunetable(num_chunks);
        PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
                num_chunks, chunk_time, max_chunk_len, min);
        return num_chunks;
@@ -186,17 +234,9 @@ static long unsigned ogg_compute_chunk_table(double time_total)
 
 static void ogg_close_audio_file(void)
 {
-       if (oggvorbis_file) {
-               PARA_DEBUG_LOG("%s", "ov_clear\n");
-               ov_clear(oggvorbis_file);
-               free(oggvorbis_file);
-               oggvorbis_file = NULL;
-       }
        free(header);
-       header = NULL;
-       header_len = 0;
        free(chunk_table);
-       chunk_table = NULL;
+       fclose(audio_file);
 }
 
 static int ogg_save_header(FILE *file, int len)
@@ -206,9 +246,10 @@ static int ogg_save_header(FILE *file, int len)
        header = para_malloc(len);
        rewind(file);
        ret = read(fileno(file), header, len);
-       if (ret != len)
-               return -E_OGG_READ;
-       return 1;
+       if (ret == len)
+               return 1;
+       free(header);
+       return -E_OGG_READ;
 }
 
 /*
@@ -222,6 +263,13 @@ static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
        vorbis_info *vi;
        ogg_int64_t raw_total;
        long vi_sampling_rate, vi_bitrate;
+       OggVorbis_File of;
+       static const ov_callbacks ovc = {
+               .read_func = cb_read,
+               .seek_func = cb_seek,
+               .close_func = cb_close,
+               .tell_func = cb_tell
+       };
 
        if (!file)
                return -E_OGG_NO_FILE;
@@ -232,24 +280,20 @@ static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
        if (ret < 0)
                return ret;
        rewind(file);
-       oggvorbis_file = para_malloc(sizeof(OggVorbis_File));
-       ret = ov_open(file, oggvorbis_file, NULL, 0);
-       if (ret < 0) {
-               free(oggvorbis_file);
-               free(header);
-               return -E_OGG_OPEN;
-       }
+       ret = ogg_open_callbacks(file, &of, ovc);
+       if (ret < 0)
+               goto err;
        ret = -E_OGG_INFO;
-       vi = ov_info(oggvorbis_file, 0);
+       vi = ov_info(&of, 0);
        if (!vi)
                goto err;
-       time_total = ov_time_total(oggvorbis_file, -1);
-       raw_total = ov_raw_total(oggvorbis_file, -1);
+       time_total = ov_time_total(&of, -1);
+       raw_total = ov_raw_total(&of, -1);
        *seconds = time_total;
        vi_sampling_rate = vi->rate;
-       vi_bitrate = ov_bitrate(oggvorbis_file, 0);
+       vi_bitrate = ov_bitrate(&of, 0);
        rewind(file);
-       *frames = ogg_compute_chunk_table(time_total);
+       *frames = ogg_compute_chunk_table(&of, time_total);
        rewind(file);
        *vss_chunk_table = chunk_table;
        sprintf(info_str, "audio_file_info1:%lu x %lu, %ldkHz, %d channels, %ldkbps\n"
@@ -259,9 +303,12 @@ static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
                vi_sampling_rate / 1000, vi->channels, vi_bitrate / 1000
                );
        rewind(file);
-       return 1;
+       audio_file = file;
+       ret = 1;
 err:
-       ogg_close_audio_file();
+       ov_clear(&of); /* keeps the file open */
+       if (ret < 0)
+               free(header);
        return ret;
 }